Notes:

I haven't seen the episode all I saw was Pan-Pizza posting this: as part of this post and I thought of the ow the edge joke when I saw that image.
Sources
Image – no idea
O and W – Too Gross for Comfort Title Card (the W is a flipped M)
THE – Lost in the Supermarket Title Card
E – Clarence Show Card
D and G – Pretty Great Day with a Girl Title Card